Bike Fit

Ask questions, sort out training partners and find out how to use that HR or power meter.

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Bike Fit

Postby Simon Hemington » Mon Oct 23, 2006 10:45 am

Without wanting to encourage anybody to slag companies off. Has anybody had any good expereinces with UK bike fit specialists.

I have had quite a few enquires recently about getting bikes properly fitted.

I think a winter session at the clubroom might be a good idea to go over the basics.
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Postby John Dowling » Mon Oct 23, 2006 1:37 pm

No direct experience but I've seen a number of very "surprising" results. The process for the widely used Dutch Procycle(I think??) system appears very scientific until you find out that they worked out the "correct" measurements by measuring 4000 (or so) Dutch racers of all cats and ages and using their data as "normal" Rather assumes that their positions were optimal before the measurement - which of course they were not.

The rules are not that complex & I for one would be happy to help anyone out.

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Postby Paul Thomson » Mon Oct 23, 2006 10:19 pm

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bike set up

Postby oldwelshman » Tue Oct 24, 2006 6:38 pm


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Re: bike set up

Postby Paul Thomson » Tue Oct 24, 2006 6:41 pm

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Simon Hemington
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Postby Simon Hemington » Tue Oct 24, 2006 7:30 pm

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Postby Boj » Tue Oct 24, 2006 9:26 pm

I am waiting with baited breath for Neil to launch into this debate.......

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Postby Paul Thomson » Tue Oct 24, 2006 9:28 pm

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neilbradburn
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bite!

Postby neilbradburn » Tue Oct 24, 2006 11:18 pm

I'll make a few comments and shut up. How's that ;)

Note: these are my own views/understandings!

As has been said already in this thread the formula based fitting systems (e.g. Biopace et al) produce bike setups that can be way out for a large number riders. Stay well clear of these!

Then there are a number of self-help rules of thumb that have been passed down through the generations. These have no logical explanation as to why they should be followed, or strong defence against critique, other than it worked for Grandpa Joe. These are things such as: knee over pedal axle, ball of foot over pedal axle and bars obscuring front hub. These rules work well for some people, but from my understanding are far from optimal for the majority.

In my view the only real way to fit someone successfully on a bike is to have them sat on said bike pedalling, and to incrementally come to a position based on the feedback of the rider and observations of an informed observer. To put it simply, for most riding disciplines (excluding short TTs) the position needs to be such that the rider is stable, confortable and without breathing inhibition for the rider to perform at their best.

Some links that people may find helpful establishing/tuning their position are:



The information given in the former is from a guy who has fitted many high level riders, from Pro Tour riders through to national champs. He's a very bright guy who approaches fitting from both a biomechanical and neurological perspective, and is always willing to consider new approaches.










Regarding going to a paid fitting specialist, I think you can personally do a better job yourself with the above literature and a good friend/cycling club. However, if you don't want to go this route and you have any doubt as to your your position on the bike then I highly recommend you go and see a commercial fitter. This will likely do far more for you performance and comfort on a bike than buying a flashy new whiz bang carbon number, and may prevent you buying a bike that can't be made to fit you properly. Plus, it'll only cost a small fraction of a new bike or other cycling bits you may have purchased in the past in the hope of resolving all your cycling problems.

-Neil

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Postby John Dowling » Tue Oct 24, 2006 11:19 pm

Nothing to add.
But still happy to help - One or two of you know i've had bad experiences of setting up Bike Postions in my relatively short but colourful coaching days so it should be fun.
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set up

Postby oldwelshman » Fri Oct 27, 2006 4:10 pm


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Re: Bike Fit

Postby Giles Haley » Wed Jan 28, 2009 1:08 pm

This thread's getting a bit old now, but I just had a Time Trial bikefit done at Sigma Sport in Hampton Wick. No charge for it, just a steel bar up your crotch ! This looks like it's a Dutch job too, haven't got the details to hand right now, but I think it was http://www.bikefitting.com.

I compared it to the setup I have naturally adopted over the years. Saddle height was millimetre-perfect, but I guess that's the easy bit ! In fact the saddle all round wasn't far off what I have. The handlebar position was, however, not that close although it's quite difficult to measure and understand the reference points that have been used (especially with my lo-pro frame and that steep top tube !). The conundrum I'm grappling with now is that the frame size specified by the bikefit may not allow me to get the same bar drop that I have become accustomed too - I'm still climbing all over my bike with a tape measure and spirit level and it's covered in squares of masking tape ! So the warning is, use it as a guide, but not a substitute for common sense !

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Re: Bike Fit

Postby Paul Thomson » Wed Jan 28, 2009 2:58 pm

Using your avatar as a guide, I would say the bars are too low and the wrists pointing down (whilst being illegal for CTT events) indicate that you are stretching to get that low. Put the cups up an inch or so and the forearms flatter and you will probably be more comfortable and more aero.

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Giles Haley
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Re: Bike Fit

Postby Giles Haley » Wed Jan 28, 2009 9:13 pm

Interesting, thanks. That photo's a good example actually, isn't it ! The bikefit is suggesting that the bars should be about half way between what my lo-pro actually is and what my road bike is, so it is indeed suggesting I should come up about 1 1/2 inches.

The one thing I've not really decided on is bars, so interested also to note your reply on the Planet-X gear. Many are just too complex for my taste - really complicated engineering and not very neat (but sodding expensive !) I might check out Planet-X then - been emailing Cammish about the wheels so might drop into their warehouse next week when I'm in Donny area.

G

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Re: Bike Fit

Postby Simon Hemington » Mon Feb 09, 2009 4:21 pm

I am always a bit sceptical about shop bike fits. However sat through one of the seminars at yesterday's TCR show given by a very knowlegable Todd Carver from Retul ().

They have a really neat 3D system which makes the measure, adjust, re-measure cycle very easy and quick. I suspect that fits done with this system will be as good as any, provided the fitter knows how to interpret the data correctly.

I believe the place you can go for this is in London, just in case Colorado is a bit far. Anybody been to see them?
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